<template>
  <div>
    <el-upload class="avatar-uploader" action="http://localhost:8080/upload" :show-file-list="false"
      :on-success="handleAvatarSuccess" :before-upload="beforeAvatarUpload"
      name="image">
      <img v-if="imageUrl" :src="imageUrl" class="avatar">
      <i v-else class="el-icon-plus avatar-uploader-icon"></i>
    </el-upload>
  </div>
</template>

<script>
export default {
  data () {
    return {
      imageUrl: '',
      grains: [
        { name: '小麦', image: require('../assets/小麦.jpg') },
        { name: '稻谷', image: require('../assets/稻谷.jpg') },
        { name: '玉米', image: require('../assets/玉米.jpg') },
        { name: '高粱', image: require('../assets/高粱.jpg') }
      ]
    }
  },
  methods: {
    handleAvatarSuccess (res) {
      // 保存图片路径
      this.imageUrl = res.data
      // this.grains.image = res.data
      // console.log(this.imageUrl)
      // console.log(this.grains)
    },
    beforeAvatarUpload (file, index) {
      const isJPG = file.type === 'image/jpeg'
      const isLt5M = file.size / 1024 / 1024 < 5

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG 格式!')
      }
      if (!isLt5M) {
        this.$message.error('上传头像图片大小不能超过 5MB!')
      }

      if (isJPG && isLt5M) {
        this.currentIndex = index // 在上传前设置当前索引
      }

      return isJPG && isLt5M
    }
  }
}
</script>

<style scoped>
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.avatar-uploader .el-upload:hover {
  border-color: #409EFF;
}

.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  line-height: 178px;
  text-align: center;
}

.avatar {
  width: 178px;
  height: 178px;
  display: block;
}
</style>
